PDF malware analysis — malicious · f95a8a1122608c9c

MALICIOUS

PDF

69.1 KB Created: 2021-09-26 16:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 14456f38e81c5b6c1670a17c2707c15b SHA-1: d39a76e1e677b2ad6c10a93a76b92bfb5ddeca6c SHA-256: f95a8a1122608c9c8f958f77d5fd5de60105df82a53c8313f989ffeb0520de82

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The high number of external URIs, many pointing to disposable domains, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9968

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://csc0516.com/userfiles/file/20210904133218_mpes7b.pdf In PDF document text
- https://gameadvisers.com/js/new/fckeditor/userfiles/file/27363361519.pdfIn PDF document text
- https://actaviaserica.org/board/file/files/92178900922.pdfIn PDF document text
- https://mtydizayn.com/userfiles/file/kekukegazobixof.pdfIn PDF document text
- http://nguoiquangphianam.com/uploads/files/32501822822.pdfIn PDF document text
- https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161502b2783a99---nufipagedotalabi.pdfIn PDF document text
- http://tamtamphat.com/upload/files/87780096530.pdfIn PDF document text
- https://markiza-trade.ru/admin/ckfinder/userfiles/files/tomedimu.pdfIn PDF document text
- http://seibyou-koujien.com/files/files/lezunipo.pdfIn PDF document text
- https://bandai-k.com/userfiles/file/tetifug.pdfIn PDF document text
- https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/52255115244.pdfIn PDF document text
- https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/13841934842.pdfIn PDF document text
- https://maytinhdalat.vn/images/uploads/files/jaridawotikowam.pdfIn PDF document text
- https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8d83f2e63---30160871224.pdfIn PDF document text
- https://rdsdealers.com/ckfinder/userfiles/files/79389358344.pdfIn PDF document text
- http://yugang360.com/upload_fck/file/2021-9-19/20210919025435973086.pdfIn PDF document text
- https://panificioilcavaliere.it/userfiles/files/59639026683.pdfIn PDF document text
- http://lso-msm.fr/userfiles/file/54089062068.pdfIn PDF document text
- http://avrig35.ro/uploads/fck_editor/file/nezexigixok.pdfIn PDF document text
- http://baigeleather.com/userfiles/file/94741855319.pdfIn PDF document text
- https://standsimulator.com/ckfinder/userfiles/files/besumekes.pdfIn PDF document text
- https://orderpoet.com/ckfinder/userfiles/files/bigov.pdfIn PDF document text
- http://balmybnb.com/t/tutorfirm/uploads/ck/files/45681312785.pdfIn PDF document text
- http://ongxoanhdpe.vn/upload/files/68793178259.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+play+a+live+photo+on+your+lock+screenPDF link annotation
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000af14.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xAF14	15140 bytes
SHA-256: `86738235bf992b5044a506ef8a595ee399ea84510256a7b44b7db6ca397156db`
`font_01_sfnt_off0000d51d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD51D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000ed34.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED34	10920 bytes
SHA-256: `5bf5bba52dcba2ff83e0251a69ce3c89d813dbdce9821a6b2a20e1b2e5e30eae`

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